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Kohler (United States) (AFP) - Dustin Johnson doesn't need to read the rule reminders posted all around Whistling Straits -- five years after PGA Championship heartbreak he knows to treat every patch of sand as a bunker.
That adds up to more than a thousand sand traps on the course nestled against Lake Michigan -- pot bunkers, shallow bunkers and scrubby, pebbly bunkers trampled down by fans.